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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69529587c535759fab9d761b3b8e55a4a238a7562cd29acf5bd2c012dc05ae18' 
  AND token = 'bhwu0098ieIvo5tifQgCSKTSM7tD2I85sptrwkAni+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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