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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c799406961098e9aa6e96011aa2635b77ab5a5f7b0754b47d0ee5a4d2390eb' 
  AND token = 'xloFXvYmoV2S3dCPD1t639ZwQIalzudtg40FhfMuhMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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