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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18677f82c12f6a9a8b7f3f7ecaa2931c9297fafdc18705f8c2fca93900577992' 
  AND token = '8o2K9kFktBwqqjk9yZ+jo4I0TwYSNttDwfwPk06FyAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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