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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcff5b4231a779db6d105fecf51fe9c85ced8dabf6d9a0eb3c3c20a6dab94ed7' 
  AND token = 'T6KxqCpSK1I1EsO7IaFhIFnZk1bRffLYZUT3DKitHtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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