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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda8854236303b265d206075621c367559d7fb8ce73b135ddb8edd64093f5608' 
  AND token = 'ccnnxCkwg0m81Ybatv1kzleT5RH+uDxMwHTtdB0WT10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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