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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a5d4fc5ff00bcad094abd4bd15b228535f3497e9ad93799a0cee19974f1b29' 
  AND token = 'gLZ41kR5ur9l87766YZr49nuEbGfFC6WXLGgM6m4vgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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