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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f76cd00cf8004d93194f09ef8b6cf68874ecbb3d7d187149a5cf8d5b80b335' 
  AND token = 'jHm4Ezm2xbTPA6eTRauZP7xuNQqbqGBrNZHhEjc5Wj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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