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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636f7ea024c76f867b4b16618881b0513cf439d34ac08f5b311b7ca12cd42d14' 
  AND token = '7ZdchYMIaT3J0wCCGf8R1n1DSesSaDANOjjsgAlRu5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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