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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473c5e3d0f5857a7a5fd890719728951df3f430769e595243fede416421995e' 
  AND token = 'PqSmX+8NwEe0L3oaceBB1Sguyri3+3NVRL3CaPFO8m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00192

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}