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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e330fa730dbb977341172dc94c6bf26b4be02c0c32a08122f177665bb7c9aa' 
  AND token = 'lwMvUZeo24MhEwaVv3jZZWzedhz/wvt5QYY1HIAtl4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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