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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da9a737484c29dce39fefee7249e764377b635e1dc58151d9add632809e64b4' 
  AND token = 'n4Ugl1KcCOh3kJLke1sQ7/FI7H9aeVoEZM/gP7u+Nfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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