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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcb2b75cf096c5bb3e77b8de7927e02a3bb85942a33f1116ac4dfebc22b9aed' 
  AND token = 'FVzJH0d1kOY+u0hyx6gDLuiM9PZWSAkMyzkMqge57Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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