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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029674505806f72d0700426fa4fd0c7875a0bcd5bb3e89fe03cd93cdb7991b3d' 
  AND token = 'kheAOv76EGmRh11NrBGzUn9k+qE7mauY5ZxlnBBrPZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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