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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b6659fba00be2bc6e87694489f4cb866e33463dc5e14b1a3104143c9a9c76b' 
  AND token = 'ywNHieJDixePFBEm7rz3tPM9HfZdxfdgKTyFL4EI+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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