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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc64ca34a636c2e52e4c19f7587e9a5c29fef1e7ed172449ae047444d256718' 
  AND token = '4wUlflIJePWVDxAW9MHX/r5yWQNUUQZ2IUQ2eCsKlGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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