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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16425b8f19d2229fbfa7d5fb2f6d02f904d3babe7fc22fc6dce6db890ded1332' 
  AND token = 'gbMbEomY2az0yEnGNc15zfheyPk8lIsx+V/qGMi8qOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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