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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b9e9d6391446719059f35c57e0e9b17f7cf98601dbccd94e7edef1aae811fe' 
  AND token = 'I2WU4ow4J5V7jMuswgUHan7VE+jWZXqxfvw49wmKnAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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