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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d5b5452d298b598fd9a999304d33dc2aa8e9fa6492757764ab77a5ad04cdb4' 
  AND token = '+slqlbQn9kQYwOWqK1dXlvaWTU7mOE5/lxHEuCAoMME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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