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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c866642be071c48cebe26ac09e71f6382a1792a6f6992dd28d38bcecffa76b' 
  AND token = '5yulC/hUi7z7tkYwpvk6dqntcjGbhDEK9QtPHSNmtLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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