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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5a8b2c8d168b3572b8655a1591fc155caf0d5ea713197252c7e17a33143955' 
  AND token = 'ANJhklQldHVTtYBUCsWwSmyDEA080mZh/N509hxVmC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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