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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415827de3a1acfb1e7b6b4f332017bbe07328b0a771d376d5b2c29a1522e9ba0' 
  AND token = 'UQ3Xrunr/Zz2m6dqa7MWq/uUGfxSSrZ5rMhxyrgFg4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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