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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ac71035fea58310bd2da20ce1c86af807223b4b3e4cee70f27febaf7e08d5c' 
  AND token = 'iJgJrTm5rzi9B688JGYRlN+Lxh+Tuy+lIMAmI9D3hjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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