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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e994c0151ad6fc6f993efa45fd12034c6d7b361abc30fc0f89fe5a422210f31' 
  AND token = 'WllUXthJwkdtADemhEatM8PXfkSpG+9ffVA/PKwcPP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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