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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5b23599d653332a6863ad0183b43415f280ad1602520988e6ec116216d9a5a' 
  AND token = 'sAevYI/uKKC4YOeCS6omfof3PbKgULWNHBJx9CdkHP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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