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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7effe31c102e73867d9a9522b9b9acf3fb60d1975c85880187755a566a22c89' 
  AND token = '9jpPT5TjZXaRJWHMHz4uO9T5FqPKTaUH9/kyADUwjPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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