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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e03f2bb0286f02cbe1b82e3d9761e6c52b27823324de6d4af73b388946fc1c0' 
  AND token = 'QCh6n9vafzQd7kWVC6EL1AQPJGldw5W8IsmwxeiUclw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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