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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c48ab0e2e15e6905e39d1a5e8b801a982ee74bde8496463c64cff2da16f4252' 
  AND token = '83xbDBGf0L0cHWyvOuVQw3KMYgZ3/kcviRgdeSpX+OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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