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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455797ade51cc79a368d6d75cb1f61f7a31e57ecaca3ab8b80c4ceb954d5886f' 
  AND token = 'XXr3DsjZK+UbHfTAsY2U7O/+Sf47ebqJDx6FD4J8WcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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