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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b2387775d9504f2591599c344176d5d7c37ae02394ebfe1ef7d33c6b06d585' 
  AND token = '7KDzpdfKVeOG1gD8BATYa95mbBlKgvATJfikP3OHtJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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