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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfc603c41ea701b596554cd020d0fb4e064bdb117f086d80356a226ea3cf6e0' 
  AND token = 'MLKDhveDT12p5KBGM+06unHA8AhbxSSm1tYECJtMNVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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