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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cec12392ef3c5f9c8e1b4a1bb385fc64a23581d6d6755756e696ab5ca3927a' 
  AND token = 'bFuvnwlrOV7ZOMEkK0E+u8fM+N/KS1nchczcORvBKdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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