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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763d27b59f051fa40e4238d967049920fa0fd76fbbfce80a28feee643aad176d' 
  AND token = '8Z6q5BZCf2zceIrkuJtBl6lXiN4vjsWjmhB5H4fMKEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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