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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7137db55b01e40602902f0400d0418dbf9b14c98147d3a864073fe642998db33' 
  AND token = '4xcHTRmDFzlr1TSDg8KuO5C0sLmO59k7s9TYsaCrgBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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