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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd36d90953955f6c372de379fdd2cf36471111c664c59505200fe60cc13f277' 
  AND token = 'DLj5H2zEMMeaoBlT8zcZd1B/6n8bvql0a+q5xs3AuIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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