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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bea05831112a96f144ee0748193ea08972a6d4d746220560ebd42bf4fe26b7' 
  AND token = 'gV5unX6+YaSgr8fHGHtMOfPA/rTtGo0mmF36GR/d+jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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