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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8d5c52d61761cff4e31c597aa5fc99fcb0f71dbc3d4a0f98d4ea9be20da9a7' 
  AND token = 'pZnCNiaOIkC0VIX/S23scoKppEDQ5axxLbOI0FEWT2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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