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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269669f856a211ab5caeba03fe0cd7470f698a95a2c4e763306a1fc0af57cfb1' 
  AND token = 'cA3d3Zt8utddHzYD8+i0YMa1UGzlxk7yoLudwFkOiEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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