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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7656c50ea599436eb18ccc29655a068a054b81a82203692ed7b329a491e4f7' 
  AND token = 'k4zJFEfpHgoL05uwBNzGPK/qzbyywIRr477pV5B6w2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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