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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c797a354887ed06498aecd537c0d381df409f7cf0fff15961a3f9cc76f9225c' 
  AND token = 'cvAU09H8u0CN3FIKWkIaqZli8NdoaJ95jTz7vw5rwLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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