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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8c6a76a6d03e7f175f4b68e58938b3088dfddf03c5331d2ada315110f4a61b' 
  AND token = 'DCGLKSaedsy8okiQ+xWUw3dhbS8AkunuEYiDjWbl5KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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