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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e37103f05cc252eb4e513058e89691f98953d7352fc2cd7699e9461e7d6962' 
  AND token = 'usI2WBp8E3eY6O1UYTIQs7HWTMagYUNTmNkN0j4Z4js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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