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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f9e5fa559d48db9e15e3098fe9dc0fdffe6a4bad26565a97959e8d29201894' 
  AND token = 'ZtxNCstauwH15yJ2G+66LqxqBq1K9ahdGYPpiFt2f34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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