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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd219a67a274b42e05f63db9f52ecebbbfe4cc96991a02049b8b8b4ef9acdda8' 
  AND token = 'p73G2MMh4ZnACYMC/CBlCsUSpxE+XsRZJT8X+o9WlJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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