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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024737b5e4a93280edee2aa6ba06dc3b5647b568881cf814d10b1e52419b401d' 
  AND token = 'zxSaZobjA4Dzk6SM22qBpS2UP2Jt8MgxvgN3XbgWP08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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