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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0be3ad8f0218c6005e418a48108ea3dead0274421fca5dbe974cd3c5e108fc' 
  AND token = 'UUG6BfRv9+xMon3MgVqeMXY3wT8ZxSb6iessDlkQ0xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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