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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1afdbed07d0f6811a547039e28cea68fb12969b95c680f8215562483e95cc86' 
  AND token = 'eoBG6V2IbvNTnFgHXj3vxlGlgut3P1OGSzGV64HOmrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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