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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3aa5308ef3851bd3a5eebe7d2abd25c0e86b8cc627210fdd94a5b3c19105f3f' 
  AND token = 'TlwWA3OHBTis3zYoSh7/9YzipPvBX9c968qKlrPJp+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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