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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d719426cb79b7d1b447faa2f5f22a9211a9c35f92a35a15d52ef0e50072280' 
  AND token = '7b5coWIngCJrrD7fvZHTczXV9ghDN8VBGH0nTCju8Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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