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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3a94df9ae2ae6356ba572b251038bcc62fcc9650fd8c6dfdc68d66b2e94762' 
  AND token = 'tp+6dIYTq2bFOA38FKsham8q1FbBFy2ZXbhbzdiFgnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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