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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138de1f8ebe6145dfa0860c16d002ea08d38462872b3400a6de95c33dc9c3c84' 
  AND token = 'JzNZlqkplnDX2ebc47DrB6YOKKnbN3nZdCR01gDJg8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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