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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1393d38ef10c82e5de6012fcfafe967baa11989fc55504f6e165ffba4e53c4' 
  AND token = 'DX8eMkrzoZHk3TxympSvHr66syHSX8myHecCplT6W9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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