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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cf43c35efccf600302f8326abf5979246338f0ca5090e6cf50dc76b8b34d8e' 
  AND token = '7uswuJu+Tb4eX/akm0E42lLHuJpcmHnEc9koVRetTEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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