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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f125ec0dcd0b5b92230cd36f35ea3c987638a1af21dc193de19f591c06a44a6e' 
  AND token = 'AXBUQAggg76WqUauG5md3+qydE1EcUXePTsf6RJHiUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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