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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00352f27ecf8e5666054bcb47478f3618279c6d8f3d92dba51cf60ffb2cccca4' 
  AND token = '+5MQEadNA4BVF5NWMI32TkBw/nENTozLZntjgUAfKz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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