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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf8306e0a678020a1c29073b79ebb510a8dd932585c1da75ba6cab101f352eb' 
  AND token = '1ZbrpB8/i384ax+k6qANg++wF1gZ1FHy3XMZTMK4m6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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