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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66556504062f996efa6a8bc8398ec35b24476987ab30e3fa81ede07c6723ca56' 
  AND token = 'rT3UclY1HOfjWZZDbMxe9Joz2vj+Ecpih7v/LoAiPeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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