SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45dd82235a0f7c64d1636b114bb4e7a2c1372af10e76360a6cc2ac2d761f2c5b' 
  AND token = 'hsJGMEn/92x7H2VocoY/0iFqBa/LVZjzLwwEXFD0ons=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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