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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4139242ba357f629d61aaddb156eca67d43bc93c8d89955b7042bdec0cba6884' 
  AND token = 'yLkQKRWxOpdTC/z/avmU6JZx3/TOfzC/KoZd4mns8Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00194

JSON explain

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