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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5459271f984134bf2e247104af5c260f44b73eac10f17926ff19361fac09b6' 
  AND token = 'jpBY2H9Gq2Oq+s8S/fjG+1+qn6hoGpTP5B6k52NRBKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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