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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f172628b4a46ab931e430a2a86386d831615d2cbf3f8c9a304c97ad417d1d8d' 
  AND token = 'CldMQ4/M1xgTjl4Urxqy7483a8u+BubkRbRrwx7IJNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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